(1) it's a violation of this statute to operate a bike on roadway less than the normal speed of traffic using roadway & not ride as close as practicable to right curb/edge of roadway

(2) it's not a violation of this statute when:

(a) overtaking or passing another bike/vehicle going same direction.

(b) preparing to turn left

(c) it's reasonably necessary to avoid hazardous conditions or other conditions that make continued operation along the right curb or edge unsafe or to avoid unsafe operation in a lane on the roadway that is too narrow for a bike & a vehicle to travel safely side by side. Nothing in this paragraph excuses the operator of a bicycle from the requirements of 811.425 (failure of slower driver to yield to overtaking vehicle) or from the penalties for failure to comply with those requirements

(d) operating within a city as near as practicable to the left curb or edge of a roadway that is designated to allow traffic to move in only one way along the roadway. A bicycle that is operated under this paragraph is subject to the same requirements & exceptions when operating along the left curb or edge as are applicable when a bicycle is operating along the right curb or edge of the roadway.

(e) operating bike next to not more than one (1) other bike as long both operate in single lane & don't impede normal & reasonable movement of traffic

(f) operating on bike lane/bike path